[Offline Pages] Create a event/activity logger

components/offline_pages/BUILD.gn

Index: components/offline_pages/BUILD.gn
diff --git a/components/offline_pages/BUILD.gn b/components/offline_pages/BUILD.gn
index bc20304c7b472b4c0a9e011aab382f8bfc1bdb4d..4730d5376e635f8e9932303961980669d6cc0856 100644
--- a/components/offline_pages/BUILD.gn
+++ b/components/offline_pages/BUILD.gn
@@ -15,6 +15,8 @@ static_library("offline_pages") {
     "client_namespace_constants.h",
     "client_policy_controller.cc",
     "client_policy_controller.h",
+    "offline_event_logger.cc",
+    "offline_event_logger.h",
     "offline_page_archiver.h",
     "offline_page_client_policy.h",
     "offline_page_item.cc",
@@ -25,6 +27,8 @@ static_library("offline_pages") {
     "offline_page_metadata_store_sql.h",
     "offline_page_model.cc",
     "offline_page_model.h",
+    "offline_page_model_event_logger.cc",
+    "offline_page_model_event_logger.h",
     "offline_page_model_impl.cc",
     "offline_page_model_impl.h",
     "offline_page_storage_manager.cc",
@@ -83,6 +87,7 @@ source_set("unit_tests") {
     "archive_manager_unittest.cc",
     "client_policy_controller_unittest.cc",
     "offline_page_metadata_store_impl_unittest.cc",
+    "offline_page_model_event_logger_unittest.cc",
     "offline_page_model_impl_unittest.cc",
     "offline_page_storage_manager_unittest.cc",
     "snapshot_controller_unittest.cc",